ok so, recently i've noticed that my battery percentage increases without charging, i mean its normal 99-98-97-96, after 5mins it goes back to 98 which i think is a good thing just wanted to make sure if the battery is not faulty (this happened only twice as of now) and my iphone is jailbroken.

I usually charge my IPhone during night. Morning - charger is out - battery 100%, in 1 hour 98%, then in 1,5 hour still 98%. No calls, no internet, no games, just a few massages through whatsapp and some changes in settings. And then suddenly 100% again.

Try rebooting the phone, its probably just the calibration being wonky. Its almost like when your low gas light goes off and on when driving. The best advice I can give to anyone is just shut off the % for the battery. It just makes people go crazy looking at it and freaking out when it drops 1 or 2 %